Refractive index measurement and particle sizing of dense particle suspensions using spectral interferometry

Peter N. A. Speets; Jeroen Kalkman

doi:10.1117/12.2671417

10 August 2023 Refractive index measurement and particle sizing of dense particle suspensions using spectral interferometry

Peter N. A. Speets, Jeroen Kalkman

Author Affiliations +

Proceedings Volume PC12622, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials VI; PC126220U (2023) https://doi.org/10.1117/12.2671417
Event: SPIE Optical Metrology, 2023, Munich, Germany

Conference Poster

Abstract

The concentration dependent attenuation, group refractive index and the Group Velocity Dispersion (GVD) of dense turbid media were determined with a Mach-Zehnder interferometer in the spectral domain for wavelengths between 400 nm and 930 nm. After calibration, all optical properties could be retrieved from a single measurement. Dependent scattering has only a small effect on the real part of the effective refractive index of a suspension. The higher sensitivity of the GVD compared to the group index allows us to test the particle concentration dependence of the real part of the effective refractive index of the medium. It was found that the interparticle correlations have a measurable effect on the GVD. The phase refractive index can be fitted to the concentration dependence of the group index. The combined measurement of the attenuation and refractive properties of the particle suspension allowed the estimation of the particle size distribution of the turbid medium through forward Mie calculations.

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Peter N. A. Speets and Jeroen Kalkman "Refractive index measurement and particle sizing of dense particle suspensions using spectral interferometry", Proc. SPIE PC12622, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials VI, PC126220U (10 August 2023); https://doi.org/10.1117/12.2671417

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